TRIANGLES | INTRODUCTION, PROPERTIES OF A TRIANGLE | What is triangle?, Sides and Angles of triangle, Types of triangle on the basis of Side, Types of triangle on the basis of angles, The sum of the three angles of a triangle is `180^@`, If two parallel lines intersected by a transversal; prove that the bisectors of the two pairs of interior angle encloses a rectangle., The sum of two angles of a triangle is equal to its third angle. Determine the measure of third angle., In a `Delta ABC`; if `2 /_A = 3 /_B = 6 /_C`; Determine `/_A;/_B and /_C`, A triangle ABC is right angled at A. AL is drawn perpendicular to BC. Prove that ` /_BAL = /_ACB`, In `Delta ABC;/_B = 45^@;/_C=55^@` and bisector of `/_A` meets BC at a point D. find `/_ADB and /_ADC`